Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2011, Vol. 22 ›› Issue (4): 251-256 doi: 10.13538/j.1001-8042/nst.22.251-256

• MISCELLANEOUS • Previous Articles    

Stable isotopes applied as water tracers for infiltration experiment

LIU Xiaoyan1,2,CHEN Jiansheng1,2 SUN Xiaoxu1 SU Zhiguo1   

  1. 1State Key Laboratory of Hydrology,Water Resources & Hydraulic Engineering;Hohai University,Nanjing 210098,China 2College of Earth Sciences and Engineering,Hohai University,Nanjing 210098,China
LIU Xiaoyan, CHEN Jiansheng, SUN Xiaoxu, SU Zhiguo. Stable isotopes applied as water tracers for infiltration experiment.Nuclear Science and Techniques, 2011, 22(4): 251-256     doi: 10.13538/j.1001-8042/nst.22.251-256

Abstract:

The δD and δ18O vertical profiles of soil water were measured prior to and after a rainfall event.Mechanisms of soil water movement were deciphered by comparing the soil water isotope profiles with the isotopic composition of precipitation.The results show that evaporation at the upper depth led to enrichment of the heavy isotopes.Compared to the loess profile,the shallow soil water of sand profile is relatively enriched in D and 18O due to macro-pore and low water-holding capacity.The precipitation is infiltrated into soil in piston mode,accompanied with significant mixing of older soil water.The preferential fluid flow in loess was observed at depths of 0-20 cm,caused by cracks in the depths.The hydrogen and oxygen isotopic compositions in outflow are close to the precipitation,which shows a mixing of the precipitation and old soil water,and indicates that the isotopic composition of outflow water is mainly controlled by that of the precipitation.The δD and δ18O in outflow decreased with time until stable δ values of outflow are close to those of the precipitation.

Key words: Precipitation infiltration, Stable deuterium and oxygen isotopes, Soil water, Piston flow